Nanoparticles as a Smart Technology for Remediation

Chidichimo, Giuseppe; Cupelli, Daniela; Filpo, Giovanni De; Formoso, Patrizia; Nicoletta, Fiore Pasquale

doi:10.1002/9781118629703.ch12

Cited by 6 publications

(4 citation statements)

References 312 publications

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“…Various techniques can be used to prepare this semiconductor, including chemical vapor deposition, molecular beam epitaxy, electrodeposition, electrospinning, sol–gel processes, sputtering, hydrothermal methods, etc. [ 5 , 6 , 7 ]. On the other hand, electrospinning represents one of the most accessible methods for obtaining these materials due to its low cost and feasibility.…”

Section: Introductionmentioning

confidence: 99%

Nd-Doped ZnO Nanostructures with Enhanced Photocatalytic Performance for Environmental Protection

Pascariu¹,

Cojocaru

Samoilă³

et al. 2023

IJMS

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Neodymium (Nd)-doped ZnO nanostructures with different amounts of Nd were obtained by the electrospinning–calcination method. X-ray diffraction measurements indicated that the prepared nanostructures have a wurtzite structure without undesirable impurities. Nd doping changes the mean crystallite size as well the lattice strain, as proved by Williamson–Hall plots. The ZnO-based nanostructures were tested as photocatalysts for methylene blue (MB) dye and ciprofloxacin (CIP) drug pollutant degradations under visible light irradiation. Corroborating the obtained results, it was found that the reaction rate constant increased almost linearly with the mean crystallite size (from 2.235 × 10−2 to 3.482 × 10−2 min−1) with a variation in the mean crystallite size from 24.2 to 42.1 nm. Furthermore, the best catalyst sample (0.1% Nd-doped ZnO) was used to optimize the photodegradation process of ciprofloxacin, taking into account the pollutant concentration as well as the catalyst dose. The removal efficiency after 120 min was about 100%, with the rate constant of k = 5.291·10−2 min−1 (CIP) and k = 4.780·10−2 min−1 (MB) for the established optimal conditions. Considering the value of the rate constant, the half-life of the reaction (τ1/2 = ln2/k) was evaluated to be about τ1/2 =13 min for CIP and 14.5 min corresponding to MB. Several catalytic cycles were successfully performed without any loss of photocatalytic activity using these nanostructures, demonstrating that the obtained nanostructures have good stability in the leaching processes.

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Section: Introductionmentioning

confidence: 99%

Nd-Doped ZnO Nanostructures with Enhanced Photocatalytic Performance for Environmental Protection

Pascariu¹,

Cojocaru

Samoilă³

et al. 2023

IJMS

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“…In contrast, Fe(acac) 3 has several advantages related to its stability, low cost, and low toxicity. 29,30 Besides, despite Fe(acac) 3 having been widely used as an iron precursor for the synthesis of pure iron oxide NCs, its use in the formation of Au−Fe 3 O 4 HNCs is rather uncommon. 18,31 The characterization of the obtained products highlights that the conditions required for the controlled formation of Au−Fe 3 O 4 HNCs and their morphologies critically depend on the iron precursor chosen, as much as on the surfactants, temperature, time, and other reaction conditions.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Fe(CO) 5 has been largely reported as precursor in the formation of Au–Fe 3 O 4 HNCs; however, its use presents some issues related to toxicity, stability, and high cost, factors that can hamper a scale-up procedure. In contrast, Fe(acac) 3 has several advantages related to its stability, low cost, and low toxicity. , Besides, despite Fe(acac) 3 having been widely used as an iron precursor for the synthesis of pure iron oxide NCs, its use in the formation of Au–Fe 3 O 4 HNCs is rather uncommon. , The characterization of the obtained products highlights that the conditions required for the controlled formation of Au–Fe 3 O 4 HNCs and their morphologies critically depend on the iron precursor chosen, as much as on the surfactants, temperature, time, and other reaction conditions. Finally, considering the great interest of these heterostructures for their use as multifunctional nanoplatforms in biomedical applications, silica coating was demonstrated to be a feasible and effective strategy to transfer Au–Fe 3 O 4 HNCs from organic to aqueous media.…”

Section: Introductionmentioning

confidence: 99%

Seeded Growth Synthesis of Au–Fe₃O₄ Heterostructured Nanocrystals: Rational Design and Mechanistic Insights

et al. 2017

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Multifunctional hybrid nanoparticles comprising two or more entities with different functional properties are gaining ample significance in industry and research. Due to its combination of properties, a particularly appealing example is Au-Fe3O4 composite nanoparticles. Here we present an in-depth study of the synthesis of Au-Fe3O4 heterostructured nanocrystals (HNCs) by thermal decomposition of iron precursors in the presence of preformed 10 nm Au seeds. The role of diverse reaction parameters on the HNCs formation was investigated using two different precursors: iron pentacarbonyl (Fe(CO)5) and iron acetylacetonate (Fe(acac)3). The reaction conditions promoting the heterogeneous nucleation of Fe3O4 onto Au seeds were found to significantly differ depending on the precursor chosen, where Fe(acac)3 is considerably more sensitive to the variation of the parameters than Fe(CO)5, and more subject to homogenous nucleation processes with the consequent formation of isolated iron oxide nanocrystals (NCs). The role of the surfactants was also crucial in the formation of welldefined and monodisperse HNCs by regulating the access to the Au surface. Similarly, the variation of the [Fe]:[Au] ratio, temperature and employed solvent were found to act on the mean size and on the morphology of the obtained products. Importantly, while the optical properties are rather sensitive to the final morphology, the magnetic ones are rather similar for the different types of obtained HNCs. The surface functionalization of dimer-like HNCs with silica allows their dispersion in aqueous media, opening the path to their use in biomedical applications.

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“…Thin films are material layers that have thicknesses varying from tens of nanometers to a few micrometers [ 1 ]. They are generally obtained by deposition processes on the surface of given substrates.…”

Section: Introductionmentioning

confidence: 99%

Chemical Vapor Deposition of Photocatalyst Nanoparticles on PVDF Membranes for Advanced Oxidation Processes

et al. 2018

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The chemical binding of photocatalytic materials, such as TiO2 and ZnO nanoparticles, onto porous polymer membranes requires a series of chemical reactions and long purification processes, which often result in small amounts of trapped nanoparticles with reduced photocatalytic activity. In this work, a chemical vapor deposition technique was investigated in order to allow the nucleation and growth of ZnO and TiO2 nanoparticles onto polyvinylidene difluoride (PVDF) porous membranes for application in advanced oxidation processes. The thickness of obtained surface coatings by sputtered nanoparticles was found to depend on process conditions. The photocatalytic efficiency of sputtered membranes was tested against both a model drug and a model organic pollutant in a small continuous flow reactor.

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Nanoparticles as a Smart Technology for Remediation

Cited by 6 publications

References 312 publications

Nd-Doped ZnO Nanostructures with Enhanced Photocatalytic Performance for Environmental Protection

Nd-Doped ZnO Nanostructures with Enhanced Photocatalytic Performance for Environmental Protection

Seeded Growth Synthesis of Au–Fe₃O₄ Heterostructured Nanocrystals: Rational Design and Mechanistic Insights

Chemical Vapor Deposition of Photocatalyst Nanoparticles on PVDF Membranes for Advanced Oxidation Processes

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Nanoparticles as a Smart Technology for Remediation

Cited by 6 publications

References 312 publications

Nd-Doped ZnO Nanostructures with Enhanced Photocatalytic Performance for Environmental Protection

Nd-Doped ZnO Nanostructures with Enhanced Photocatalytic Performance for Environmental Protection

Seeded Growth Synthesis of Au–Fe3O4 Heterostructured Nanocrystals: Rational Design and Mechanistic Insights

Chemical Vapor Deposition of Photocatalyst Nanoparticles on PVDF Membranes for Advanced Oxidation Processes

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Seeded Growth Synthesis of Au–Fe₃O₄ Heterostructured Nanocrystals: Rational Design and Mechanistic Insights